如下所示：
//下面这段宏考过去直接用
#define SYNTHESIZE_SINGLETON_FOR_HEADER(className) \
\
+ (className *)sharedInstance;\
+ (void)destroyInstance;
//在单例生成之前onceToken = 0,在单例生成之后onceToken = -1了,之后一直保持-1这个值,知道这个之后我想你应该有思路了
#define SYNTHESIZE_SINGLETON_FOR_CLASS(className) \
\
static className *shared##className = nil; \
static dispatch_once_t onceToken;\
+ (className *)sharedInstance\
{\
return [[self alloc] init];\
}\
+ (className *)allocWithZone:(struct _NSZone *)zone\
{\
dispatch_once(&onceToken, ^{\
shared##className = [super allocWithZone:zone];\
});\
return shared##className;\
}\
- (className *)copyWithZone:(NSZone *)zone\
{\
return shared##className;\
}\
- (className *)mutableCopyWithZone:(NSZone *)zone\
{\
return shared##className;\
}\
+ (void)destroyInstance {\
shared##className = nil;\
onceToken = 0;\
}\
//用法，注意要遵循NSCopying,NSMutableCopying 协议 import <Foundation/Foundation.h> @interface YNHTUserModel : NSObject<NSCopying,NSMutableCopying> SYNTHESIZE_SINGLETON_FOR_HEADER(YNHTUserModel); @property (nonatomic,copy) NSString* inviter_id;//邀请人ID @property (nonatomic,copy) NSString* token; @property (nonatomic,copy) NSString* nick_name; @end
#import "YNHTUserModel.h" @implementation YNHTUserModel SYNTHESIZE_SINGLETON_FOR_CLASS(YNHTUserModel); @end
以上这篇ios 单利的完整使用实例 及销毁 宏定义就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持。
